[Newbies] Design with Visitor

[math]

> Subject: Design with Visitor
> From: "Mathieu SUEN" <mathk.sue at gmail.com>
> Date: Wed, 24 May 2006 23:14:58 +0200
> To: beginners-bounces at lists.squeakfoundation.org
>
> Hi squeakers,
>
> I have to build  a lite code for home work.
> The objective is to gave to user a possibility to store his sport
> performance.
>
> So I have design a Class Performance(with PerformanceCollection) and I
> wanted to let things like TimeLaps, Date, Distance, and so on.
> for a later implementation (if we wanted to add others).
>
> So I provide a Measure abstract  class.
>
> Hence I add a dictionary in my Performance with the class for key and
> the instance for value:
>
> for example:
>
> Performance>>addMeasure: aMeasure
>           dictionaryOfMesure at: aMeasure class put: aMeasure
>
> Now I have to bring them in a Seaside UI so I guess that Visitor Pattern
> ( ;-) ) can help me but my complex structure mess my brain.
> So I ask you if you think that can be possible(and how) or other pattern
> can be more suitable for this problem.
>
> Thank you for your attention (:
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>   
Thinking forward I see that 2 Performance instance couldn't be compare
so befor asking how to print them I will think about a other structure.
I think I will use Builder or Factory Method pattern.

Thanks